yeah, i figured you meant that the stars themselves were 300 shots.
the way i've done star trails was to shoot many short star exposures and blend them. then put them on top of one exposure for the non-changing land.
did you stack 300 exposures of the land?
I know that you control the illumination. that is why i suggested making the land portion darker, just because that seems more natural as a night shot to me. but i think it's an awesome image just the way it is. it is just my taste that i am referencing.